Motor Controllers Autopsy And Analysis

Motor Controllers Autopsy And Analysis

  Before I begin, be warned. A picture is worth a thousand words, and I dont have any pictures today, so this post is going to be a pretty big wall o text. If youre willing to brave my rambles, read on. Im currently finishing up my latest revision of ChibiTroller (v2.0), and since I first began controlling larger-scale bruushless things Ive gone through many different controllers. Most of which Ive blown up. This is a reflection and analysis of what Ive gone through so far, and what Ive learned.…

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Motor Controllers Autopsy And Analysis

Frames Revamped: Chibi vs. Chipi

POTW Procrastination Edition I did it! I got rid of all the waterjet cut bits! Heres the bare chibikart frame.I was trying to keep too much of it the same. So I replaced everything.   And heres what I got. Its the same thing, just welded steel instead of aluminum extrusion. And its a bit heavier, but not by too much (thin wall tubing is nice like that). Even so, extra weight just sounds like an excuse to use bigger motors. But anyways, heres a preview of whats coming (hint:…

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Motor Controllers Autopsy And Analysis

ChipiKart More Steering Redesigns!

Building The Darn Thing Part 4 of n Ive had to stop building because Ive built everything Ive designed so far. And since Im trying to make this repeatable, I need to fully design everything and resist the urge to just start welding things together until a car comes out. To that end, I need steering to happen. I have the rear wheels mounted to the frame, and if I can get the front wheels and steering done then I can do chipikart soap box derby edition. Ive trashed my…

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Motor Controllers Autopsy And Analysis

ChipiKart In which I Dont Play With Motors

  So. Motors. Chibikart uses two Turnigy SK3 5065 motors, driver sensorless by Jasontrollers. Its cheap and powerful, so I can dig it. But whats better than the grinding, powerful not-launch of a sensorless drive? The smooth, terrifying launch of a sensored one. Id been thinking about how to achieve this on a vehicle, especially after seeing TinyKart at NYC Maker Faire. And then I forgot.Charles recently posted about adding sensors to sensorless motors and driving them with Jasontrollers. And I realized that it was what I wanted to do,…

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Vehicles

Building The Darn Thing Part 6 of n

Building The Darn Thing Part 5 of n Maker Faire San Mateo is quickly approaching, and with it the first event of the 2013 Power Racing Series. Which means that ChipiKart is going to have to be much more than a gravity-powered death trap, and fast. With this deadline in mind, Ive been plowing ahead, and am pleased to present this thing. Its most of a ChipiKart. With some changes. The original steering wheel was made of 3/8 thick acrylic, which is brittle enough as is, and really didnt last…

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Blog

Building The Darn Thing Part 5 of n

The State Of The Chipi Building The Darn Thing Part 5 of n Well, I went through a quick blitz of making things, then kind of dead-ended. By which I mean I ran out of parts and had to stop work. But heres what I got done. Steering: I built the steering column! And made a steering wheel! And didnt take any pictures, but heres some video of what it looks like laser-cutting 3/8 acrylic on a 30W CO2 laser.   And then I had a rolling chassis, and wanted…

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Blog

Building The Darn Thing Part 1 Of n

ChipiKart In which I Dont Play With Motors The title says it. Time to build. A quick steel run and some time with the chop saw later, this happened. Thats most of the base of the frame. When making a frame like this, the trick is to break it down into individual units of two pieces, weld the units square, and then weld the units together. That way, the whole frame stays strong and square. So! Welding! Back frame reinforcements, cooling down. Then the rest of the base gets welded…

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Blog

A Digression: Batteries

  Well, ChipiKart is done(ish). It raced at the San Mateo Maker Faire, but thats another story. One thing Ive been meaning to do to ChipiKart is replace the lead-acid batteries with something better, like one of the more stable lithium technologies. Those are expensive, though. But at the maker faire, I was able to pick up some pretty neat surplus. This is a A123 module. Its 16.4v, 2.5 Ah. But thats not the fun bit. The fun bit (aside from the super-flat discharge curve) is the (reported) maximum discharge…

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Blog

Modifying The Lathe Compound

An Aside Making Counterbores   Today, I wanted to do some single-point thread cutting on the lathe. But when I went to set the compound, I noticed this.   My tool post was butting up against the edge of the compound, and so I couldnt rotate it to set it straight. Actually, When I first got the tool post, it didnt fit at all. I had to mill a bit away so it would sit flat. I didnt think to mill away enough to be able to turn the post.…

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